Cyber security

Inbound SSH Connection To Vulnerable XZ Machine : CVE-2024-3094 Exploits

This KQL query can be used to detect post exploitation activities related to CVE-2024-3094. This vulnerability is related to reports of malicious code being embedded in XZ Utils versions 5.6.0 and 5.6.1.

Multiple sources suggest that the malicious code is ingested in functions that SSHD leverages to bypass authentication features, this is yet to be confirmed.

If you only want to list devices with the vulnerable version use:

DeviceTvmSoftwareInventory
| where SoftwareName has "xz"
| where SoftwareVersion has "5.6"
| distinct DeviceName

Defender For Endpoint

let VulnerableXZDevices = DeviceTvmSoftwareInventory
    | where SoftwareName has "xz"
    | where SoftwareVersion has "5.6"
    | distinct DeviceId;
DeviceNetworkEvents
| where DeviceId in (VulnerableXZDevices)
| where ActionType == "InboundConnectionAccepted"
| where InitiatingProcessFileName contains "ssh"
| extend GeoIPInfo = geo_info_from_ip_address(RemoteIP)
| extend country = tostring(parse_json(GeoIPInfo).country), state = tostring(parse_json(GeoIPInfo).state), city = tostring(parse_json(GeoIPInfo).city), latitude = tostring(parse_json(GeoIPInfo).latitude), longitude = tostring(parse_json(GeoIPInfo).longitude)

Sentinel

let VulnerableXZDevices = DeviceTvmSoftwareInventory
    | where SoftwareName has "xz"
    | where SoftwareVersion has "5.6"
    | distinct DeviceId;
DeviceNetworkEvents
| where DeviceId in (VulnerableXZDevices)
| where ActionType == "InboundConnectionAccepted"
| where InitiatingProcessFileName contains "ssh"
| extend GeoIPInfo = geo_info_from_ip_address(RemoteIP)
| extend country = tostring(parse_json(GeoIPInfo).country), state = tostring(parse_json(GeoIPInfo).state), city = tostring(parse_json(GeoIPInfo).city), latitude = tostring(parse_json(GeoIPInfo).latitude), longitude = tostring(parse_json(GeoIPInfo).longitude)

Varshini

Varshini is a Cyber Security expert in Threat Analysis, Vulnerability Assessment, and Research. Passionate about staying ahead of emerging Threats and Technologies.

Recent Posts

Nmap cheat sheet for beginners

Nmap (Network Mapper) is a free tool that helps you find devices on a network,…

1 hour ago

Understanding the Model Context Protocol (MCP) and How It Works

Introduction to the Model Context Protocol (MCP) The Model Context Protocol (MCP) is an open…

7 days ago

The file Command – Quickly Identify File Contents in Linux

While file extensions in Linux are optional and often misleading, the file command helps decode what a…

1 week ago

How to Use the touch Command in Linux

The touch command is one of the quickest ways to create new empty files or update timestamps…

1 week ago

How to Search Files and Folders in Linux Using the find Command

Handling large numbers of files is routine for Linux users, and that’s where the find command shines.…

1 week ago

How to Move and Rename Files in Linux with the mv Command

Managing files and directories is foundational for Linux workflows, and the mv (“move”) command makes it easy…

1 week ago